Back when indoor trainer stands were first being developed (at least the first time in my life) Racer Mate had an add onto the seat post axial fan (blower wheels) set up that they intended to be used when the bike was clamped to their support stand. This quickly evolved into having the fans mounted onto the stand directly. But this add on unit could also be used outside on the open road. I know a racer guy who did for his training. Andy(who made his own set for roller riding).